methods.rb

require "pry"

array = %w[Brooke Gehrig Cecilia]
# the given method we want to rewrite
# array.each{|name| puts name}
# def my_each(array)
#     yield array
# end
# my_each(array) {|a| puts a}
# the following will show that this isn't quite right  we will need
# to modify the above method to go through each item in the array
# my_each(array) {|a| puts "I am #{a}"}
def my_each(array)
  i = 0
  while i < array.length
    yield array[i]
    i += 1
  end
end

# my_each(array) {|a| puts "I am #{a}"}
# the implicit return of Ruby is the last item it evaluated
# explicit return will stop the execution of code
def my_find(array)
  i = 0
  while i < array.length
    return array[i] if yield array[i]

    i += 1
  end
end

# puts my_find(array) {|a| a[0] == "C"}     # irb returns item if called this way:
# my_find (array) {|a| puts a[0] == "C"}
def my_map(array)
  i = 0
  new_array = []
  while i < array.length
    item = yield array[i]
    new_array << item
    i += 1
  end
  new_array
end
puts my_map(array, &:upcase)